I have a Huari scooter with a 4000 watt hub motor that died all of a sudden when doing 55 on a freeway. I discovered that the breaker was thrown but when I reset it, the motor ran very rough and wouldn't go past 20 mph. I managed to get home but it soon quit altogether. I pulled the hub and took it to a friend with lots of experience working with hub motors. He tested the hall sensors and they all appear to be fine. When he tested what appears to be a thermal sensor, it was open (no continuity). So my question: Does this motor in fact have a thermal sensor and what is its normal state, open or closed?
One of the wires was also black so that could be an indication of a problem, but he did not think that would cause the motor to quit entirely. We have not tested the controller but as this scooter came with no documentation, he was not sure how to go about testing it.
I'll attach a picture of the suspect wiring and of what we think is the thermal sensor (white rectangle in the middle with 2 white wires).